{"id":"5833f820-c29c-4568-9a9e-7fdf3390eb19","shortId":"J9SYyW","kind":"x402","title":"x402-gated backup endpoint on Base, pay-per-request with USDC at $0.02/call.","tagline":"x402-gated backup endpoint on Base, pay-per-request with USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/backups/23`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.\n\nThe specific `/api/v1/backups/23` endpoint accepts POST requests and returns `application/json`. Payment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a maximum amount of 20,000 base units, which at 6 decimals equals $0.02 per request. The x402 challenge was successfully captured (HTTP 402), confirming the endpoint is live. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the exact request body schema, response format, and the nature of the \"backup\" resource at ID 23 are unknown. There is no OpenAPI spec or detailed docs available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","backup-resource"],"categories":["storage","infrastructure"],"synonyms":["backup API","premium API access","x402 backup endpoint","lowpaymentfee","USDC pay-per-call","Base network API","data backup endpoint"],"warnings":["No documentation available — all doc/pricing/API pages show only 'Connect wallet'","No OpenAPI or schema describing request body or response format","The specific purpose of '/api/v1/backups/23' (backup ID 23) is unclear — it may be a demo or placeholder","No information on what data is returned or what POST body is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/23","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/backups/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the purpose of the 'backups/23' resource is unexplained. All doc pages return only 'Connect wallet' with no useful 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'/call':16,32 '0.02':15,31,117 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':100 '20':108 '23':190 '300':142 '402':127 '6':114 'Base network API' 'USDC pay-per-call' 'accept':88 'access':41,155 'advertis':146 'ai/ml':66 'amount':106 'analyt':65 'api':40,61,148 'application/json':93 'avail':201 'backup':4,20,186 'backup API' 'backup-resource' 'base':7,23,82,102,110 'behind':75 'beyond':158 'bodi':177 'broader':52 'call':60 'captur':125 'challeng':122 'confirm':128 'connect':171 'contract':99 'data':64,69 'data backup endpoint' 'decim':115 'detail':199 'doc':200 'document':157 'dozen':55 'empti':164 'endpoint':5,21,34,62,87,130 'equal':116 'essenti':163 'exact':175 'finance/web3':68 'format':180 'gate':3,19,74 'howev':156 'http':126 'id':189 'infer':67 'infrastructur':71 'instant':154 'json-response' 'key':149 'land':160 'limit':152 'live':132 'lowpaymentfee' 'lowpaymentfee.com':36 'maximum':105 'natur':183 'network':83 'offer':54 'openapi':196 'page':161,168 'part':49 'path':45 'pay':9,25,58 'pay-per-cal':57 'pay-per-request':8,24 'payment':78,94,133 'per':10,26,59,118 'platform':53,145 'post':89 'post-method' 'premium':39 'premium API access' 'protocol':79 'provid':37 'rate':151 'request':11,27,90,119,176 'resourc':42,187 'respons':179 'return':92 'schema':178 'second':143 'sent':135 'settl':96 'show':170 'span':63 'spec':197 'specif':85 'sub':167 'sub-pag':166 'success':124 'timeout':140 'unit':111 'unknown':192 'usdc':13,29,98 'usdc-base' 'util':72 'wallet':172 'x402':2,18,77,121 'x402 backup endpoint' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"3f1f3e42-d3d2-443d-b33d-dca6c1f409a3","listingId":"5833f820-c29c-4568-9a9e-7fdf3390eb19","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/backups/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:23.307Z"}],"sources":[{"listingId":"5833f820-c29c-4568-9a9e-7fdf3390eb19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:23.307Z","lastSeenAt":"2026-04-22T10:32:34.179Z"}],"details":{"listingId":"5833f820-c29c-4568-9a9e-7fdf3390eb19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/23"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/23"}],"useCases":["Retrieving or creating backup data via a single paid API call","Agent-driven workflows that need on-demand backup access without API key management","Programmatic pay-per-use access to backup resources on Base L2"],"bestFor":["Developers wanting keyless, pay-per-call API access settled in USDC on Base","AI agents that can handle x402 payment challenges natively","Users who prefer micro-payment models over subscription billing"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","High-volume batch operations where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.007Z"},"updatedAt":"2026-04-22T10:32:34.179Z"}}